Jack for truing wheels



" (NoM0de1.)-

O H METZ JACK FOR TRUING WHEELS.

No. 557,001.- Patented Mar. 24,1896.

tion sufficiently NITED STATES- PATENT OFFICE.

CHARLES H. METZ, OF HIGHLANDVILLE, ASSIGNOR'TO THE WVALTHAMMANUFACTURING COMPANY, OF WVALTHAM, MASSACHUSETTS.

JACK FOR TRUING WHEELS.

SPECIFICATION forming part of Letters Patent No. 557,001, dated March24, 1896.

Application filed January 5, 1894.

T0 at whom it may concern.-

Be it known that I, CHARLES H. METZ, of Highlandville,in the county ofNorfolk,State of Massachusetts, have invented certain new and usefulImprovements in Jacks for Truin g IVheels, of which the following is adescripfull, clear, and exact to enable any person skilled in the art orscience to which said invention appertains to make and use the same,reference being had to the accompanying drawings, forming part of thisspecification.

The object of the invention is to securely and accurately locate the rimof a wheel and its hub while the spokes thereof are being adjusted andsecured in the rim.

Figure 1 is a vertical transverse section of my improved truing-jack;Fig. 2, a top plan view of the upper jaw or member; and Fig. 3, a likeview of the lower jaw, showing the wheel in position.

Like letters of reference indicate corresponding parts in the differentfigures of the drawings.

Much difficulty is experienced in truing the rims of bicycles or similarwheels where the spokes are taken up by screw-sockets, this ordinarilybeing accomplished by mounting the wheel on centers at the hub,tightening the spokes separately and rotating the wheel rapidly toobserve the variations. Such work requires skilled labor and aconsiderable expenditure of time in effecting the desired result.

My invention is designed particularly to furnish a jack whereby theWheel-rim may be trued by inexperienced persons with much more accuracyand far quicker than by the means ordinarily employed.

In carrying out my invention I make use of means which will be readilyunderstood by all conversant with such matters from the followingexplanation.

In the drawings, Y represents the base or support of the jack and may beof any suitable form, its top I) being faced up to allow the jackmembers to rotate readily thereon.

The lower jack member, A, comprises a circular frame, centrally throughthe hub d of which a screw-center z is turned. From the hub spokes fproject radially, their outer Serial No. 495,761. (No model.)

ends being connected by a rim g. This rim g has its edge at h beveledinwardly at an angle of about forty five degrees, as best shown inFig. 1. From each spoke f there are vertically-arranged radialprojections a a, which will pass between the spokes of the bicycle-wheelC when it is adjusted thereon. These projections are interiorly tappedand screw-threaded at Z; concentric with the screwcenter 2, and thebeveled rim h is also concentric therewith.

The jack member B has a hub is, which is threaded to enter the threadedsocket i, and a screw-center .2 is turned into said hub in alignmentwith the center .2. The periphery or rim m of the member B is turnedconcentrically with the screw-centers and beveled inwardly at rightangles, or approximately so, to the corresponding edge h of thecompanion member A. To hold said member A from revolvinga pin 10,passing through the base Y, enters a suitable socket in said member.

In the use of myimprovement arim x of the bicycle-wheel is placed on thebeveled face 7L, and the hub 19 of said bicycle-wheel is disposedbetween the two centers .2 By turning down the jack member B the rimwill be forced outward between the two beveled surfaces h m andconcentrically with the hubcenter. The spokes t of the bicycle-wheelhaving been previously placed loosely into the wheel are drawn up by theordinary screwnipples which pass through the rim 0:. The hub and rimbeing rigidly held in the jack, it is substantially impossible to drivethe nipples beyond their proper place, so that when they are all turnedup the rim may be released from the jack and all parts thereof beconcentric.

The work is greatly facilitated by removing the pin to and rotating thejack in order to bring the succeeding nipples in front of the operator.The bevels h m on the peripheries of the jack member are not essentialto its proper working in all cases. I therefore do not confine myself tobeveling said members in the manner shown, as any means which will applyradial force to the wheel-rim equally at all points and hold theWheel-hub rigidly at the common center may be employed without departingfrom the spirit of myinvention.

IOO

The two members of my jack may be connected at more than one pointwithout departing from my broad invention,and Iintend to cover such aconstruction in my claims. Such a structure is specially described andclaimed in mypending application, Serial No. 561,660.

Having thus explained my invention, what I claim is- 1. In awheel-truingjack, the combination of a member having a centering device to supportthe wheel-hub, and means for exerting a spreading action on thewheel-rim; a second member, having a centering device and having meansfor supporting the wheel-rim against such pressure, and positivemechanism for causing said members to approach and recede from eachother and for maintaining them in parallelism during their operation onthe wheel.

2. In a wheel-truing jack, a movable member provided with acentering-screw to engage the wheel-hub, and with means for exerting aspreading action on a wheel-rim, and a centrally-disposed operatingdevice whereby said spreading means are caused to hold the periphery ofthe wheel-rim equidistant at all points from the center of the hub.

3. A wheel-truin g jack,having two members with peripheries forsupporting the wheelrim, and with central hubs having centering devicesfor the hub of the wheel, and a centrally-disposed connection betweensaid members.

4. A wheel-truing jack, consisting of two members having centeringdevices for supporting the wheel-hub and peripheries for supporting thewheel-rim, and positive mechanism for causing saidperipheries toapproach and recede from each other in parallel planes.

5. In a wheel-truing jack, two members having centering devices forsupporting the wheel-hub and peripheries for exerting outward pressureon the wheel-rim, and mechanism for causing said members to approach andrecede from each other, and for maintaining them in parallelism duringtheir operation on the wheel.

6. Atruing-jack for wheel-rims comprising two circular members arrangedconcentrically, one of said members being socketed to receive a threadedprojection on the companion member and the peripheries of both membersbeing beveled, substantially as described.

7. In a truing-jack for wheel-rims, a base in combination with acircular member beveled peripherally and mounted to rotate on said base;a companion member having a threaded projection working in a socket insaid first member and concentrically therewith; and screw-centers in theaxial line of both of said members, substantially as and for the purposeset forth.

, 8. Inatruing-jack for wheel-rims, the member, A, having the bevelededge, h, and pro] ections, a, interiorly screw-threaded in combination'with the member, B, having the bev eled edge, m, and threaded hub, It,turned into said projection.

9. In a truing-jack the member, A, having the beveled edge, 7L, andprojections, a, interiorly screw-threaded in combination with themember, B, having the beveled edge, m, and threaded hub, it, turned intosaid projection and the screw-centers, ,2, .2 in said members all beingarranged to operate substantially as described.

CHARLES II. METZ.

\Vitnesses:

ALFRED STAINFORTH, CHAS. J. SPIEGELBERG.

